HR 3220

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HR 3220
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.75[2]
Characteristics
Evolutionary stage Blue straggler[3]
Spectral type F6 V Fe-0.8 CH-0.4[4]
U−B Template:Engvar −0.05[2]
B−V Template:Engvar +0.44[2]
Astrometry
Radial velocity (Rv)+23.7[5] km/s
Proper motion (μ) RA: −113.750[1] mas/yr
Dec.: −297.923[1] mas/yr
Parallax (π)55.3398±0.5399 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+3.19[6]
Orbit[7]
Period (P)Script error: No such module "val".
Semi-major axis (a)Script error: No such module "val".
Eccentricity (e)Script error: No such module "val".
Periastron epoch (T)Script error: No such module "val".
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Semi-amplitude (K1)
(primary)		Script error: No such module "val". km/s
Details
A
Mass1.35[3] Template:Solar mass
RadiusScript error: No such module "val".[1] Template:Solar radius
LuminosityScript error: No such module "val".[1] Template:Solar luminosity
Surface gravity (log g)4.12[3] cgs
TemperatureScript error: No such module "val".[1] K
Metallicity [Fe/H]−0.27[3] dex
Rotational velocity (v sin i)8.8[6] km/s
Age10[3] Gyr
B
MassScript error: No such module "val".[3] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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HR 3220 is a binary star system in the southern constellation of Carina. It has the Bayer designation B Carinae; HR 3220 is the designation from the Bright Star Catalogue. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 4.75.[2] Based upon parallax measurements, it is located at a distance of 59 light years from the Sun. The system is drifting further away with a radial velocity of +24 km/s.[5]

This is a single-lined spectroscopic binary system with an orbital period of Script error: No such module "convert". and an eccentricity of 0.12.[7] The visible component is an F-type main sequence star with a stellar classification of F6 V Fe-0.8 CH-0.4,[4] where the suffix notation indicates mild but anomalous underabundances of iron and the methylidyne radical. The secondary is most likely a helium white dwarf with 0.47 times the mass of the Sun. Mass transfer from the white dwarf progenitor has given the primary the spectral signature of a blue straggler that appears much younger than its actual age of about 10 billion years.[3]

References

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  8. ↑ Template:Cite simbad

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Template:Stars of Carina

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